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参数资料
| 型号： | TSC2301IZQZR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA120 |
| 封装： | GREEN, PLASTIC, VFBGA-120 |
| 文件页数： | 49/95页 |
| 文件大小： | 1322K |
| 代理商： | TSC2301IZQZR |
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OPERATION - TEMPERATURE MEASUREMENT
X+
MUX
A/D
Converter
Temperature Select
TEMP1
TEMP2
°K +
q DV
k n(N)
(7)
DV + V I82 –V I1
(8)
°K +
q DV
k n(N)
(9)
TSC2301
SLAS371D – SEPTEMBER 2002 – REVISED AUGUST 2004
In some applications, such as estimating remaining battery life or setting RAM refresh rate, a measurement of
ambient temperature is required. The temperature measurement technique used in the TSC2301 relies on the
characteristics of a semiconductor junction operating at a fixed current level. The forward diode voltage (VBE) has
a well-defined characteristic versus temperature. The ambient temperature can be predicted in applications by
knowing the 25°C value of the VBE voltage and then monitoring the delta of that voltage as the temperature
changes.
The TSC2301 offers two modes of temperature measurement. The first mode requires calibration at a known
temperature, but only requires a single reading to predict the ambient temperature. A diode, as shown in
Figure 61, is used during this measurement cycle. The voltage across this diode is typically 600 mV at 25°C
while conducting a 20-A current. The absolute value of this diode voltage can vary several millivolts, but the
temperature coefficient (TC) of this voltage is very consistent at -2.1 mV/°C. During the final test of the end
product, the diode voltage would be measured by the TSC2301 ADC at a known room temperature, and the
corresponding digital code stored in system memory, for calibration purposes by the user. The result is an
equivalent temperature measurement resolution of 0.3°C/LSB. This measurement of what is referred to as
Temperature 1 is illustrated in Figure 62.
Figure 61. Functional Block Diagram of Temperature Measurement Mode
The second mode does not require a test temperature calibration, but uses a two-measurement (differential)
method to eliminate the need for absolute temperature calibration, and achieves a 2°C/LSB accuracy. This mode
requires a second conversion with a current 82 times larger than the first 20-A current. The voltage difference
between the first (TEMP1) and second (Temp2) conversion, using 82 times the bias current, is represented by
kT/q ln (N), where N is the current ratio = 82, k = Boltzmann's constant (1.38054 x 10-23 electron volts/degree
Kelvin), q = the electron charge (1.602189 x 10-19 C), and T = the temperature in degrees Kelvin. This method
can provide much improved absolute temperature measurement without calibration, with resolution of 2°C/LSB.
The resultant equation for solving for °K is:
where:
(in mV)
Temperature 2 measurement is illustrated in Figure 63.
53
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| TSC2302IRGZ | 功能描述:触摸屏转换器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| TSC2302IRGZG4 | 功能描述:触摸屏转换器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
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